In particular, they were asked about some modeling scenarios, which had suggested there could be as many as 4000 deaths a day without appropriate measures in place.

One MP accused them of frightening a lot of people, but Sir Patrick said it was based on an assumption to try to get a reasonable worst case scenario.

Our science editor, David Shankman, has more details.

It's the risk of the health service being overwhelmed.

That suddenly changed government policy, a decision based on scientific projections for how maney thousands the virus might kill in the coming months.

But looking at this official graph, what are the rial chances of the worst scenario being right?

That's the question that MPs raised today, putting the government's top advisors on the spot.

You don't think that you just frightened people who do not have your scientific background and understanding of models or not, I hope not.

I mean, I think I hope not, and that's certainly not the aim.

It's very difficult to project forward in a way that doesn't inevitably lead Thio.

Problem of is that really no, it's not really is a model, but it is what we need to understand, because this is a disease which is spreading, like all epidemics in a way that will affect us in weeks to come but isn't felt today.

Some of the projections for future deaths were made before the regional three tier system had any effect on.

Like any computer models, they're meant to be a guide to what might happen rather than a firm prediction.

So is there a clear sense of the impact of the virus today?

We got the latest figures for what are called excess deaths.

That's deaths above average shown on this line here, based on data over the last five years.

Back in April, losses were massively above that average line, and nearly all of them were because of covert 19 looking Mawr.

Recently, there are signs of another increase in deaths.

Above average on the main cause is Covic.

The number of hospital admissions is the key indicator of what's happening right now, and whatever the arguments over future scenarios, there's a warning that things are mostly going the wrong way.

Rates is still steadily tracking up in ALS.

The data that I have seen in the older age groups who are the ones who are likely to translate into hospitalizations.

I see you cases Andi deaths.

The reality is that on average, someone who's infected is spreading the virus to Mawr than one other person.

And the hope is that the new restrictions will help to reverse that.

David Shankman, BBC News Everyone who lives or works in Liverpool will be offered a rapid coronavirus test, whether they have symptoms or not.

From Friday, military personnel will have to deliver the pilot scheme on.

If it's successful, it could be rolled out.

Across the United Kingdom are health correspondent Dominic Hughes, reports from Liverpool.

But what did the wars do?

People's like so many others across the country, pupils at ST Margarets Academy in Liverpool on making up for time lost during the first lock down.

The imagery tends to be more positive hit the threat to their education from the coronavirus remains, especially from those who are asymptomatic, who don't yet have symptoms but can still infect others.

Hard to people to come out of the way if I was the school if we've being affected so badly already.

But what do these six formers think about the plan for citywide testing?

You've got a factor in all the people that don't want to get tested because you can't force people to get tested.

People aren't being safe, especially in the reports being feel like cases where people just aren't sticking toe isolation, rules and stuff.

So I think I can see it from the point of view why they want to do that.

People do live in, Forget about the coronavirus.

So what set a lot of people's minds if they knew a definite yes or no?

Whether you've got it, it's an opportunity to drive down the R Rated.

The school's principal is Stephen Briley.

I think if we've got good, accurate knowledge of who's got it and who hasn't, our schools will be safer because there'll be less asymptomatic people in school.

There'll be fewer people who are infected, fewer people in schools who are affected and therefore more Children staying in school, more learning going on.

The livable pilot will start this week as well as existing swab tests, there will be what are known as lateral flow tests, which can provide a result within an hour without the need to use a lab.

Organizing citywide testing will be a logistical challenge.

The Army will once again help as it did during the first wave of the pandemic.

The head of the test and trace program in England, which has been criticized for having only a marginal impact on reducing infections, says.

This will be a team effort.

This is a program led by Liverpool for Liverpool.

We together want to find as many people who have the disease is possible so that we can stop them infecting others.

And that's the way we will all get back to work and get back to the lives we want to live.

Even a citywide testing program won't be enough to stop cove it in its tracks.

The basics washing her hands, wearing a face covering maintaining social distance remain the best way to stop the spread of the virus on There are big questions about how many people are going to want to self isolate if they're not showing any symptoms and how many will be willing to come forward for a test if it potentially means missing out on work on the pay that will bring any time you fire in a.

In a city that has seen some of the highest number of covert cases in the UK, the big question is whether MAWR testing will help slow or even reverse the spread of the virus and help keep places like ST Margarets free from infection.

Dominic Hughes, BBC News Liverpool.